Edge grinding machine



Jan. 8, 1935. J. P. CROWLEY EDGE GRINDING MACHINE 1934 4 Sheets-Sheet 1Filed May 17,

Q/dSEPH P GFOWLEX Z44 g Quorum Jan. 8, 1935. J, P, CROWLEY EDGE GRINDINGMACHINE Filed May '17, 1934 4 Sheets-Sheet 2 1 (2)06L'PH CROWLEY y Jan.8, 1935. J. P. CROWLEY EDGE GRINDING MACHINE Filed May 17, 1954 4sheets-Sheet 5 Juventpr dost- H P dronu-v Gttcrncg Jan. 8, 1935. v J. P.CROWLEY 1,987,054

EDGE GRINDING MACHINE Filed May 1'7, 1934 4 Sheets-Sh et, 4

3nven tor Q/OSEPH P CROWLEY attorney Patented Jan. 8, 1935 1,987,054 1EDGE, GRINDING MACHINE g Joseph P. Crowley, Toledo, Ohio, assignor tovLibbey-Owens-Ford Glass Company, Qhio, a corporation of Ohio Toledo,

ApplicationMay 17, 1934, serial No. 726,055

19 Claims.

I: The present invention relates broadly to improvements in grindingmachines generally and more particularly to a machine for roundingend/or finishing the edges of sheets or plates of:

-5 ass en ih the" provision of a grinding machine of relativelysimplified and inexpensive construction primarily designed for use ingrinding the curved edges or corners of sheets or plates of glass whichare to be employed as door or window lights in automotive vehicles,although it is ofcourse-in no way restricted tosuch use.

Another object of the invention isthe provision of such agrindingmachine of the abovecharacter different l' contour s andembodying generally a rotary grinding wheehmeans-mounted above saidwheel for, supporting, a plurality of glass sheets tobe treated, an'dmeans for .r,ocking said sup. porting means. to move the glass sheetsbackward 1 and forward with the curyededges =thereofto be ground overand in engagement with the grinding wheeL-said sheet supporting meansbeing mounted for free vertical-guided movement during therockingthereof. and'dependingupon the contour or curvature of :the edgesbeingsurfaced.

Other objects-and advantages of theinvention will becomemore apparentduring the course of the following description when taken in connectionwith the accompanying drawings. I In the drawingsswherein like numerals.are em ployed to designate like parts throughout the samel I Fig. 1 is"a side elevation of an installation ineluding two" spaced' igrindingmachines constructed in accordance withthepresent invention and a'conventional polishing machine arranged therebetween,

Fig.2'is a vertical section through one of the I grinding machines takensubstantially on. line 242 f Fig.1, V I q Fig. 3 -is a'detail'sectiontaken substantially on line 3- -3 of Fig. 2, 5

Fig. 4 is a perspective view ofthe upper portion of the grinding machineshowing particularly the AnimpQrtant object of thisinvention resides inand 8 to 10.

means for supporting .the".glass sheets to be. treated, f. Fig.5 is a,detail section taken-substantially on line 55 of Fig.2, Fig 6 is asection taken substantially on-line, 66ofFig.4, J

Fig. 7 is a View of one of the side members of the.glasssupportingmeans,H I Figs. 8,.9 andlo'are side viewsshowing different positions assumedby the sheet supporting means and the glass sheets during the grindingoperation, and v Fig. 11 is a side elevation of the sheet support.- ingmeans modified to receive glass sheets having a difierent contour fromthose disclosed in Figs. 1

Referring now to the drawings and particua larly to Fig. 1, there isillustrated one type offactory installatiorrembodying twogrindingimachines A and B, constructed in accordance with the presentinvention and a conventional polish: ing machine C. The grindingmachines are disposed opposite one another in spaced relation and thepolishing machine is arranged thereb etweenr The edges of the glasssheets 15, after being; ground upon the grinding machines A. andB,;'areadapted to be polished upon the polishing ma chine C. With thisparticular installation,. a single polishing machine can handle theglass ground uponboth grinding machines inasmuch as it takes longer togrind than to polish. Thus,

While one of the grinding machines-is in operation,"

an operator can be removing'the ground sheets from the other grindingmachine and effecting the polishing or finishing of the edges of saidsheets upon the polishing machine. The polishing machine includes apolishing wheel 16 rotatable; about a substantially horizontal-axiswithin a receptacle 1'7 adapted to contain a suitable polish-v ingmaterial withinwhich the lower portion of; the said polishing-wheelrotates as is well knownin the art.- The glass sheet, shown in broken;

lines and designated 15a,is adapted to be manu-, ally moved, by theoperator back and forth over the polishing wheel. h p

In order to facilitate the transfer of theglass sheets from the grindingmachines A. and B to the polishing machine C,.there may.be arranged atopposite sides of the said polishing machine a runway D comprising aseries of horizontally I aligned rotatable rolls 18. The operatorcahthen" slide the glass sheets from the grinding machines along therunway to the polishing machine. 'Thei installation shown in Fig. 1 willermit; of the grinding and polishing of a maximum number'ot sheetsrapidly and conveniently and with a minimum amount of handling. Ifdesired, however, two polishing machines can be employed, with each ofthe polishing machines being adapted to receive the glass sheets fromone of said grinding machines.

The grinding machines A and B are adapted'to produce what is termed inthe art as a pencil edge upon the glass sheets. The term pencil edge isused to designate an edge which is rounded transversely of the sheet toremove all: sharp or square corners. Inasmuch as the two grindingmachines are of exactly the same construction, a detailed description ofonly one will .be given. Thus, upon reference particularly to Fig. 2,each grinding machine includes a base 19 which is adapted to supporttherotary grind ing wheel 20 and the motor 21 for driving the same, saidmotor being mounted upon the top of said base and the grinding wheelbeing arranged to one side thereof.

The grinding wheell20 is keyed to one end of a horizontal shaft 22' andis provided in its" periph being journalled at its outer end in abearing 26 carried by a gear case 27 suitably secured to the" Said;Keyed to the shaft ,22within gear.

case 27 is a relatively large gear 28 meshing with a relatively smallergear 29' fixed to the shaft 30 of motor 21, said shaft being preferablyiour naled' in a bearing 31 also carried by gear case 27. Upon operationof the motor'21, it will be readily apparent that the shaft 22 will be:driven through thei'ntermeshing gears 28 and 29"to effectthepes'it'i'verotation or the grinding wheel.

cept'aele 32 within' which the grinding'wheel" 20 is received, saidreceptacle being adapted to contain-a suitable abrasive material. withinwhich the lower portion of the said wheel is immersed in a manner wellknown in the art. The top of the receptacle 32 is provided with aslot 33through which the upper portion of thegrinding wheei project'si Thereceptacle is also; preferably provided with a door 34 to permit accessthereto' and a drain outlet 35 at one corner thereof.

The base 19' is slidabiy associated with the re"- ceptacle 32 so that itcan be moved vertically relative thereto to either raise or lower thegrinding wheel. I To this end, the rear vertical wall 36 or thereceptacle is formed with a vertical underout n el or way 3' g. 3-)within which the slide 38 formed on or carried by the base 19 isreceived. The rear wall of said receptacle is also provided with avertical slot 39 through. which projects the annular portion 40 of thebase 19 within'whic'h bearing 24 is mounted.

The base 1 9 is supported upon a screw 41 threaded at its lower endwithin a vertical cylin derojr sleeve 4'2 carried upon the base portion43 of receptacle 32. The base 19 is formed with a recess 44'', and keyedto the upper end of screw shaft 4'7 is arod48 constituting a handlewhich may be grasped by the operator to facilitate the turning of shaft47. From the above, it will be seenthat when it is desired to eitherraise or lower the base 19 and consequently the grinding wheel 20, it issimply necessaryfor-the operator to grasp the handle 48 and turn theshaft 47 in the desired direction. The rotation of gear 46 will serve toeffect a corresponding rotation of gear and upon rotation-i015thls'latter gear, the screw 41 will bethreaded upwardly or downwardlywithin the sleeve 42 to effect either the raising or the lowering of thebase and grinding wheel.

The means for supporting the glass sheets 15 to be ground comprises acarrier or holder designated in its entirety by the numeral 49, said,

holder being mounted above the grinding wheel 20'tor free vertical. androcking movement relative thereto as will be more fully hereinafterdescribed. The work holder 49 comprises a pair of spaced verticalsidemembers 50 and 51 between which a plurality of the glass sheets 15are adapted to be received sothat the edges thereof} may be groundsimultaneously, said sheets being disposed on edge ina vertical positionand thesaid side members 50 and 51 being so-shaped that upon rocking ofthe work holder, the-curved edges or corners 52 of the glass sheets tobetreated will be moved backwardQand forward over-and in engagement withthe grinding wheel. It will be noted that the sidemember 51' isrelatively" smaller than side member 50.

5 Arranged transversely between and carriedby the side members 50 and 51of work holder 49 are the two rollers 53 and 54- respectively, saidrollers 50, adjacent the upper end thereof, are the three rollers 55',56- and 57, while carried thereby ad jacent the lower end thereof and insubstantial V v 7 h alignment with roller v54 are rollers 58 and 59.Arranged at the front of the base 19 is a re'- The rolls;53 to 59 areadapted to receive the glass sheets 15 therebetween and to maintainthei'nin proper position within the work holder during the grindingoperation, the grinding of glass sheets of different contours bringinginto use difierent rollers. For instance, as shown in Figs. 1 and-"8f to10, the glass sheets 15" are maintained in posi-f 54,55, 56 and 58, theroller 57 having'been removed. Were the sheets 15b slightly longer, theywould also be supported by the roller 59;

The roller 53 comprises a horizontal bolt60 (Fig. 6) having its innerend extending through an inclined slot 61 in the side member 50 andbeing secured inplace by a nut The opposite or outer end of the boltextends through a cir-" the bolt 60 is a metal bushing 65 carrying asleeve 66 preferably made of relatively soft rubber.

This sleeve is formed with a plurality of. unifo'nn I ly spaced annularflanges 67 which define therebetween a plurality of grooves 68 within.which grinding wheel 20. Carried upon the bolt at opposite ends of thesleeve 66 arecollars 69 and '10.

The roller 54 is of the same constructionjand.v

arrangement as roller 53 and is carried by' the side members 50 and 51in the same manner, the

D011 60 thereof passing through an inclined'slot 71in side member 50.The slots'ql and '71 in side member are'provided in orderto facilitatethe proper positioning of the side'm'ember 51'withber and being securedin place by nuts threaded upon the said boltsoutwardly thereof; Theslots '12 to 76-are provided to permit-the rollers to 59 respectively to;be adjusted with respect to "one another in a manner to permit ofthe-grinding of glass sheets of different sizes. Likewise, any one ofthe rollers 55 to 59 can be readily and conveniently removed should itbe found necessary in order to accommodate a particular. shape :orsizeof sheet. Forinstance, a glass sheet 15 of one particular. shape andsize is'illustrated in :Figs. 1'

and 8 to 10, and in this case'the upper substantially horizontalstraight edge a thereof. engages the rollers 55 and 5 7; the curved.bottom edge'b thereof the rollers 54 and 58; and the substantiallyvertical straight edgec the roller 53'. The bottom edge I; and sideedgec' areconnected by the corner or curved edge 52 to :be ground; On theother hand, in Fig. 10, and because of the particular shape of the glasssheet 15b, the-roller 57 has been'removed and theupper edge d of thesaid sheet engages roller 56; the inner curved edge e the rollers 53 and55; and the bottom edge ,1 the rollers 54 and 58. The curved edge e andbottom edge 1 are connectedby the curved edge 52 to begiound. Therollers 55 to; 59 are of course each provided with a plurality ofgrooves 68 which arein alignment with thegroovesinrollers 53 and 54 andlikewise in 'registrywith the grooves in thegrinding wheel. I

Mounted 'upon the top of the receptacle 32 at opposite sidesthereof is apair of" opposed guide brackets '77 and 78' respectively, each beingformed with a vertical guideway '79 within which is slidably-mounteda-guide block"80 for free ver tical movement." Securedto'the outersurfaces of the side members 50 and 51 of the work holder.

and extending diagonally thereoi are plates 81 and 82 respectively.Carried byeach of the side members 50 and'51 of the workholder' andpassing transversely through the respectiveplate 81 or 82 (Fig. 5) is atrunnion 83 riveted to the said side member as--at 84. Each 'trunnionprojects: outwardly beyond the respective plate 81 or 82 and is looselyreceived within the respective guide block 80 so that it can turn freelyrelative thereto; With this construction, it will be readily apparentthat the trunnions 83' define a horizontal axis about which the workholder 49 is adapted'to be rocked to move the corners or curved edges ofthe glasssheets to be ground over and in engagement with the grindingwheel and; that during such rocking movement the said'work holder willbe permitted to move freely'vertically, depending shaped crank levers 91and 92 respectively, said crank levers being mounted intermediate theirand '59 are also a of subends upon a horizontal shaft 93 journaledin thehorizontal bearing 94 formed at the upper end of a bracket 95 secured tothe receptacle 32 by'bolts or other suitable fastening elements 96.

I Carried at the opposite or outer ends of the V- shaped levers 91 and92 are pins 97 and 98 to which are pivotally connectedthe upper ends ofthe substantially vertical pitman rods 99 and 100, each of said rodsbeing also pivotally connected at its lower end to a crank 10,1 keyed toa horizontal shaft 102, said shaft being driven from a motor 103 througha suitable drive 104 and reduction gearing'located' in the housing 105.Upon rotation of the shaft 102, the pitman rods 99 and will be given asubstantially vertical up and down motion'to effect the rockingof the \lshaped crankievers 91 and 92' first in one direction and then the otherto impart a' substantially horizontal forward and'backward motion to theconnecting rods 8'? and 88. The reciprocation of the connecting rodswill cause a rocking of the work holder 49 as the trunnions 83 turnfreely within guide blocks 80, thereby causing the glass sheets 15 to bemoved backward and forward, with the curved edges 52- thereof tobe'ground over and in engagement with the'grinding wheel 20. Simultaneouslywith'its rocking movement, the said work holder will be permitted tomove freely vertically as a result of the guide block 80 operatingwithin guideways 79. In the operation of the machine described above andwhen it is desired to grind the curved I pit'man rods 99 and 100 will beat substantially the limit of their upward movement and the-connectingrods 8'? and 88 in their extreme forward position. The glass sheets tobe ground are then inserted horizontally into the outer open'end of thework holder between the upper rollers 55 and 57 and the lower rollers 54and '58, the upper" edges a of the'said sheets being received within thegrooves in the first-mentioned pair of rollers,

while the bottom edges 2) thereof are received After the glass sheetshave been thus properly" positioned the motor 103 is placed in'operationto rotate shaft 102 and draw the pitmen 99"and 100 downwardly, thismovement causing the .crank levers 91 and 9 2'to be rockedin a counter-'clockwise direction to retract the connecting rods 87 and 88. .Thismovement of the connecting rods will cause the work holder 49 to be alsorocked in a counterclockwise direction and during the turning of thesaid work holden'the curved edges 52 of the glass'sheets will of coursebe moved overand inengagement with the grind- .ing wheel 20, beingreceived within the grooves 23 thereof. The work holder is turnedapproximately 90 and at the limit of its backward movement will assumesubstantially the position illustrated in" Fig. 10, at which time theglass sheets will be'supported upon the roller 53. r n

-When the work holder 49 is in this position; the crank 101 hascompleted approximately onehalf a revolution so that upon continuedturning of the said crank, the pitmen 99 and 100 will be startedupwardly, thereby causing the crank levers 91 and 92 to be rocked in aclockwise direction to effect forward movement of the connecting rods 87and 88. This movement of the cam holder, preparatory to the grindingoperation, the said holder is adapted to be in this position grindingwheel 20.

nectingrods will in turn cause the work holder to be'rocked also in aclockwise direction-toreturn. it to its starting position shown in Fig.8. During the rocking of the work holder, the grinding wheel 20 isalsobeing positively driven from motor 21. g

,It will of course be readily apparent that upon rocking of the workholder 49, the said holder willbe permitted to simultaneously movefreely vertically, depending upon the curvature of the sheet edges beingground, said work holder being guided in a definite path during itsvertical movements by means of the guide blocks operating in theguideways 79 ofguide brackets 77 and '78. Due to the aboveconstruction,. curved edges of different contours can be readily andconvenientlyground upon the machine and without necessitat-' ing anyspecial adjustment totake careoi. 'each particular curve, except asregards the adjust ment of the rollersrelative to oneanother to takecare of difierent size sheets. This renders themachine capable of a wideuseand permits the simultaneous grinding of a plurality of sheets of.glass rapidly, accurately, and economically, and with a minimum efiortand attention on the part of the operator. While the machine has beenreferred to above as a grinding machine and,

also while it is primarily designed for this purpose, yet it may bereadily adapted for polishing;

the curved edges of the glass sheets by the substitution of a suitablepolishing wheel. for the It is desirable, in the operation of themachine, to effect a slight raising of the glass sheets at thecompletion of the grinding operation to lift the said sheets out ofcontact withthe grinding wheel in order to prevent burning of the edgesbeing ground. To this end, there is carried upon the top of thereceptacle 32,'adjacent the for- 7 Ward end thereof, two spaced blocks106 and-l07 adapted to be engaged by the side members 50 and .51respectively of the work holder at the completion of the grinding cycleto efiect a slight wheel (Fig. 8). Also, upon loading of the work sothat the curved edges 52 of the glass sheets will not contact with thegrinding wheel as'the said sheets are being placed in position. When themotor 103 is then placed in operation to rock the work holder, thecurved edges of the glass sheets will be gradually lowered to engage thegrinding wheel as illustrated in Fig. 9.

Ordinarily, it will be found that one backward and forward rockingmovement of the work holder is sufficient to effect the desired grindingof the glass sheets. Therefore, the present invention contemplatestheprovi sion of means for automatically shutting off the motor 103 andstopping the rocking movement of the work holder at the completion ofthe grinding operation. For

of the work holder for cooperation with the switch is a trip member 111(Figs. 2, 8 and 10). In practice, after the work holder has been rockedin a counterclockwise direction to the position illustrated in Fig. 10and then. returned to its starting position shown in Fig. 8 tocompletethe rindin'gtcychewthe trip member 1111 roller'llfi will force. thecontrol. arm; lw downawardly'to open switehlfltl; thereby the.

circuit through motorlilaandfstopping the move-;

ment of the'work holder. The trip emberiii,

1 however, is not. adapted .to actuateswi-tch 103 m after thesidemembers 50'and 5 1 of the'work hold-1 er-eng-ag-ing blocks 106, and107 haverCfil s l thej and thatwarious changes in theshape, size andarrangement of parts 7 may 5 be resorted to without departing fromthespiritoi the invention (or the; scope of the :subioined claims. .Ielaim:

macli'ifie for? smidingme: curved glasssheet' plate armrmding when,

positioned to rotate. about a substantially-herb zontalfaxisymeans.above said. grinding;-

wheel: for supporting the. glass sheet: to *beground on edge in asubstantially vertical position,;means for 'rockingfsaidsupporting meansto move; the

means forwguiding th m supporting meansam, its vertical movements.

2. In a machine'for grinding the. curved-edgeof' a glass sheet orplate,a rotary grinding wheel po sitioned, torrotate abouts. substantiallyhorizontal axis, means mounted-above giindinsrwheel for supporting ;theglass sheet to be ground on edge in a substantially vertical positionmeans tor-mounting said sheet supporting meansefor free; verticalandrocking movement, means forrocking the supporting means,- ild ineansvfor guiding the said supporting meansin adefinite pathduring v rt cal;movement thereof;

-'3. In .a ;machine. for grinding the curved; of a glasssheet orplate,:a'! 0$a y..flrinding wheel; positioned to; rotate aboutasubstantia-lly hori-- zontal axis, means mounted above saidgrindingwheel for supporting the glass sheet to beground on edge inasubstantially .vertioall'po sition, means for pivotallysaidsheetrsupporting: means,- means for rock n the supporting meansaboutits pivot to move. the curved edge of the sheet to begroundover andiniengagementiwith the grinding wheel, and means 'for -guidingly sup*-.po t the: said sheetsupnor msflmew for: re vertical; movement during therocking thereof p 4. a'mae fo s l a eou v the curved iedgesyofawplurality. ofwglass sheets orplates, a rotary grinding wheel positione1'0 "1'0- tate about a; substantially axis,a work? holder arranged abovesa-ld wheel and adaptedtoi support the glass sheetsto beground on'edge;in a substantially; vertical. position, said work; holderincludingspaced vertical side members be tween. whichsaid sheets arereoeivedand carried by and arranged between said side-1 members formaintaining the said sheets-in position during grinding, .meansconnected with the (work and in engagement with the; grinding wheel,said work :holder being mounted for-free vertical movement during therocking thereofiand means for,

guiding the said work holder in its vertical movements. i

- In a machine for simultaneously grinding 50 I I e g received withinsaid guideways, said last-menv 7. In a machine ,work holder is adaptedto be rocked; ,and'means wconnected with said workholderlion-rocking thecurvededges of a plurality of glass sheets or plates,

a rotary grinding wheel positioned to rotate about a substantiallyhorizontal axis, a work holder, ar

' ranged above said wheel and adapted to support the glasssheets to beground on edge in a substantially, vertical position, said work holderineluding spaced vertical side-members between;- which said sheets arereceived and means carried same, and means for guiding the said workholder v.in a definite path during vertical movement j {are received anda plurality of horizontal rollers thereof. I I i i 6. In a machine forsimultaneously grinding the curved edges of a plurality of glass sheetsadapted to support the glass sheets to be ground on edge inasubstantially vertical position, said work holder including spacedvertical side members between which said sheets are received and meanscarriedby and arranged between said side sition during k grinding,

said work holder for rocking the same about its pivot to move the curvededges of the sheets over and in engagement with the grinding wheel, and

.means for guidingly supporting the said work holder for free verticalmovement during the rocking thereof; I i v for simultaneously grindingthe curved edges of a pluralityrof glass sheets or plates, a rotarygrinding wheel positioned .to rotate about a substantially horizontalaxis, a work holder arranged above said wheel and adapted to support theglass sheets to be ground on edge in; a substantially vertical position,said work holder including spaced vertical side members ;between whichsaid sheets are received and means ;.carr ied by and arranged betweensaid side members for maintaining the said sheets in position duringgrinding, f xed guide brackets mounted atopposite sides of the workholder and having vertical guideways therein, means carried by thesidemembers of said work holder and slidably tioned means being"constructed tocau se rocking movement ofthe' work holder relativev tosaid guide brackets, andmeans for rocking the said work holder to movethe curved edges, of the sheets over and in engagement with the grindingwheel. l

a' machine for simultaneously grinding the curved edges of a'pluralityof glass sheets or plates, a rotary grinding wheel positioned to rotateabout a substantially horizontal axis, a work holder arranged above saidwheel and adapted to support the glass sheets to be ground on edge in asubstantially vertical position, said work holder and loosely receivedwithin 'said blocks' .deflninga horizontal axis, about which the saidsame about such axisto; movethe curved edges of the sheets over and inengagement withthe I 9.,In amachine for simultaneously-grinding thecurved edges of a plurality of glass sheetsor I v plates, a rotarygrinding wheel positioned ;-t o,ro-

grinding wheel. 7 x

tateabout asubstantially horizontal axis and having a plurality ofgrooves formed ,in thepe- Q10 .above said grinding wheeland,comprising.spacedv vertical side members'betweenwhieh saidsheetscarriedby and arranged-between said side members' for maintaininggtheglass sheets in position during grinding, said rollersbeing providedwiths 'o vesinr e st y witht e v i h ind? wheel and, within which the ledges of the glass sheets are adapted tQ be received, means for reekingsaid work holder to move thecur-vededgeszqf the glass sheets over and inengagement with the grinding wheel, saidwork, holder being mounted forfree vertical movement? during ,the rocking thereof, and means forguiding the saidholder in its verticalmovements.

' 10. In; a machine for simultaneously grinding the curved edges ofalplurality of glass sheets or plates, a rotary grinding Wheelpositioned to ro- ,tate about a substantially-- horizontal axis-andhaving'a plurality of grooves formed in the peripherythereof, meansforsupporting the glass sheets to be, ground 1 on edge a substantiallyvertical position including a holder arranged above saidgrinding wheeland comprising spaced vertical side members between which said sheets Iare received and a plurality ofhorizontal'rollers carried by andarranged between said side 'nein- ,bersfor maintaining the glasssheetsin position during grinding, said rollers being provided withgrooves in registry with thegrooves in the grinding wheel and withinwhich the edgesof the glass sheets are adapted to be received, means'f rmounting said work holder for freevertieal and rocking movement, meansfor rocking the work holder, and means for guiding]'the"said work holderin a definitelpath during verticalfmov'ee ment thereof. 11. In a machinefor simultaneously, grinding the curvededges of a plurality of glasssheetsjor plates, a rotary grinding wheel positioned to 1'0- above saidgrinding wheel and comprising spaced vertical side members between whichsaid sheets are received and a pluralityof horizontal rollers carried byand arranged between saidsidej'mem bers for maintaining the glasssheetsin position during grinding, said rollers being proyidedwithgrooves in registry with the groovesthe grind} ing wheel and withinwhich theedgesmi'the glass sheets are adapted to "be received,]means forpivotally mounting said workfholder, means .for rocking the work holderab out itsjpivotfto move the curvededgesof the sheets over and inengagement with-the grinding; wheel, and

means for guidingly supporting the said work holder, for freevertical;movement during the oc t 1 1:

11 .11 a machine fo imultaneouslrlsr n ins the curved 'edges of aplurality of glass sheets or plates, a rotary grinding wheel positionedto rotat about a substantially horizontalaxis and a plurality ofgroovesio'rmed in the pe- 31 5 riphery thereof, means for supporting theglass "game brackets mounted opposite sides of the 3 work; holderand-havingvertical guideways there- 'infmeans oarried-bythe side membersof said workholder and slidably received within said guidewa-ys; saidIasft mentionedmeanS being of jsu'h ionstructionas to ea'use; rockingmovement or; the were holder relative to said guide brackets,- and-hearsro roc mg the said work holder to move thefeurvededgesof the sheets overand in engagement with "the grinding wheel.

13 m a machine for simultaneously grinding the curved edges of aplurality of-glass sheets orpl'ates; a was grinding wheel positioned torotate about a substantially horizontal axis ia'ndhavinga plurality ofgrooves formed in: the periphery-"thereof; rnarisfor supporting theglass sheets to b efgjround on edge in a substantially vert cal positionincluding a holder arranged abovefsaidgrmding wheel and comprisingspaced verticalside members between which said sheets are'received and aplurality of horizontal rollers "carried byand arranged betweensaid-side members' for maintaining the glass sheets in posidurinjgififidingjgsaid rollers being provided f with groovesin registrywiththe grooves in the gr dingjwli'ee'l' within-which the edges of p doracketsiniounted-at oppositesides of the workholderandhaving vertiealguideways therefin blpfck's jslidably mounted; said guideways, ri qntalcarried by' the side memoftliework holder and loosely reoeived with-"said blocks deflning-a horizontal axis about which s d w klha d r. s adp d be 'jed',; and: iriean'sifcdnnected with said work 'hol'drjfor thesame-about such "axis to have theeiirved edges, of the sheets over andin @112? m in with. the grinding wheel; 1 I

"1.4 in, a machine for-simultaneously grinding curvededgesoi laplurality of glass sheets 6171912; 5, a rotary grinding wheelpositioned; to rotate about 'a"sub stant ially' horizontal axis, aworkholdjer arrangedabovesaid wheel and adapt led'to support the'glasssheets to'be ground on 'ed'ge in'a substantially vertical'position, saidwork iliolfd'er including spaced :vertical side members between whichsaidlsheets are 'received-and-means carr ed] by and-arranged'betw'eensaidside inembersfifor rnaintaining the fsaid sheets in'posir19 1 .d in' i n ine m or Pivotally t ing" the workiholder aboutits "pivot to move the det sof the sheets '--over-and 'fen'gagemeritwith thegrinding- "wheel, means for "guidmay-supporti g the said workholder for free vertical; movement during the I rocking thereof, said"rocking means inc -l'lidifig Substantially hori 'zemr-cennectmgrbaspivotally mounted at th'eir inner ends to opposite sides ortneworknmder, Wiiiszisrar reuproeatmg SaidCohhectiIigrbds tioned meansincluding substantially horizontal eluding a motor and operative driveconnections egglassjsheetsare-adapted tobe received, fixedcurvIed' edgesof the sheets "over" and- --r-,98'z,oks4

including a motor operative drive connections between said motor andsaid. .1- q 1 v I 15. In a machine for simultaneously m thecurved'edg'es'of a -plur'ality of glass sheets-"or o plates, a rotarygrinding wheel positionedfto -ro- 51 5 tate about a substantiallyhorizontal) axis and having a plurality of grooves formed in theperiphery thereof, means for supporting'theglass sheets to be ground onedge ina substantially are received and a plurality of horizontalrollers carried by and arranged between said jsidei'nembers formaintaining the glass SIieets in pOeition during grinding, said rollersbeing provided with grooves in registry with 'thegrooves' -intheg-rinding wheel and within whieh' the edges 0f the glass sheets areadapted to be received; guide brackets mounted: at opposite sides of-thework holder and having ver'tiealg'uideways there'- in; blocks slidablymounted iinsaid 'guideways,

horizontal trunnion's carriedby the side members of the work holder andlo'o'sely received said blocks defining a horizontal axis-about'wliichthe said work holder is adapted tofb'e rocked, and means for rockingtheworkfholder to mojve the curved edges of the {sheets overand ineng agement with the "grinding wheel, sa-id last-men'- J connecting rodspivotally' mounted at their inner ends to opposite sidesof' said workholden'and means for reciprocating said-connecting rods inbetween saidmotor and said rods; o 35 16. In a machine for simultaneously grindingthe famed edges or a plurality 'ofglasssheets p a o a y ding wheelpositioned to rotate about a substantially-horizontal"axis a work holderarranged above said wheer and 40 adapted to support theglas's' sheets tobe ground on edge in a substantially vertical positiimgsaid workholder'including spaced vertical side-mermbers between which said-"sheetsarereceivedand I jmeanscarried by andarrangedbetween said side membersfor maintainingrtlre said sheets-in postiti'o'n during'grinding; meansfor pivotally mount ing the workholder about its pivot to o t ate- 'mentwith the grind ng wheel, guid fingly 'supportingthe "said work holderfor free vertical movement during the said rocking 'm'eansyincludingsubstantially zontal connecting 'rodspivotally mofintedat tlreir innerends tooppositefsidesof the worr s me, means for reoiprocatingsaidoonn'eiiting' rods eluding a, motor and operative drive conneotie'insbetween Said motor arid staid od' sf'afldfmeans engageable'bytheworkholfderjat'th omflienon o offth'e'grinding'eyeleiorfiraisingsaidwoi'kfhold in or 'to liftithe g'lass' 'sheet's out ofenga'gementthe" grinding. wheel.

17. In a'machine forjsi'multaneouslygii" ding 'the curved"edge's 'fof fap luralityfof'glass sl'iets or plates, a rotary' grindi'nghelipo'sitionedto rotateabout a substantiall horizontal akis' and'havmg= a s1ur 1ay or groov 'rdnned mtme pe ripherythereoffmeansflforsummit g sheets to be groundon-"edge in a: vertical "position: including=a, -holder: arranged above said 'gr-indingwheat-and comprisingvertical; "side members arereceived and a plural itw a: horizontalrollers ca Iri'ed-by and arran gd betwbn said 'sifle' ni'm b'e'rsformaintain i'ng the glass 'sheets imposition M during grinding, saidrollers being provided with grooves in registry with the grooves in thegrinding wheel and within which the edges of the glass sheets areadapted to be received, fixed guide brackets mounted at opposite sidesof the work holder and having vertical guideways therein, blocksslidably mounted in said guideways, horizontal trunnions carried by theside members of the work holder and loosely received within,

said blocks defining a horizontal axis about which the said work holderis adapted to be rocked, means for rocking the work holder to move thecurved edges of the sheets over and in engagement with the grindingwheel, said last-mentioned means including substantially horizontalconnecting rods pivotally mounted at their inner ends to opposite sidesof said work holder, means for reciprocating said connecting rodsincluding a motor and operative drive connections between said motor andsaid rods, and means engageable by the work holder at the completion ofthe.

grinding cycle for raising said work holder to lift the glass sheets outof engagement with the grinding wheel.

18. In a machine for simultaneously grinding the curved edges of aplurality of glass sheets or plates, a rotary grinding wheel positionedto rotate about a substantially horizontal axis, a

work holder arranged above said wheel and,

to said guide brackets, means for rocking the said work holder to movethe curved edges of the sheets over and in engagement with the grindingwheel, said rocking means including a motor and operative driveconnections between the motor and work holder, and means actuated bysaid work holder at the completion of the grinding cycle toautomatically shut off said motor and bring the work holder to a stop.

19. In a machine for simultaneously grinding the curved edges of aplurality of glass sheets or plates, a rotary grinding wheel positionedto rotate about a substantially horizontal axis, a; work holder arrangedabove said wheel and adapted to support the glass sheets to be ground onedge in a substantially vertical position, said work holder includingspaced vertical sidemembers between which said sheets are received andmeans carried by and arranged between said side members for maintainingthe said sheets in position during grinding, fixed guide bracketsmounted at opposite sides of the work holder and having verticalguideways therein, means carried by the side members of said work holderand slidably received within said guideways, said last-mentioned meansbeing constructed to cause rocking movement of the work' holder relativeto said guide brackets, means forrocking the said work holder to ,movethe curved edges of the sheets over and in engagement with the grindingwheel, said rocking means including a motor and operative driveconnectionsbetween' JOSEPH P. CROWLEY.

